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Races ofPhytophthora in festans in France, 1991–1993

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Summary

Nineteen races were found among 116 isolates ofPhytophthora infestans recovered from French potato and tomato crops during 1991–1993. The most common races were 1.3.4.7.11. 1.3.4.7.8.11 and 1.3.4.7.10.11 in 1991, race 1.3.4.7.11 in 1992, and race 1.3.4.7.10.11 in 1993. None of the isolates was virulent to either R2 or R6, and only one to R5. The mean number of virulences per isolate was 5.78 in 1991, 4.35 in 1992 and 4.53 in 1993. TheP. infestans population from Brittany showed mainly quantitative changes in the frequencies of major races over the period investigated, but races identified were almost the same in all 3 years. No geographical substructure was apparent, since variation between locations accounted for only 13–22% of the total racial diversity within the Brittany population. This is interpretated as evidence for limited gene flow in this population, which is believed to have evolved from a few founding genotypes.

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  1. Station de Pathologie Végétale, INRA, BP 29, F-35650, Le Rheu, France

    D. Andrivon

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Andrivon, D. Races ofPhytophthora in festans in France, 1991–1993. Potato Res 37, 279–286 (1994). https://doi.org/10.1007/BF02360520

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